drivers/nfc/nfcmrvl/main.c

   1 /*
   2  * Marvell NFC driver: major functions
   3  *
   4  * Copyright (C) 2014-2015 Marvell International Ltd.
   5  *
   6  * This software file (the "File") is distributed by Marvell International
   7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
   8  * (the "License").  You may use, redistribute and/or modify this File in
   9  * accordance with the terms and conditions of the License, a copy of which
  10  * is available on the worldwide web at
  11  * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
  12  *
  13  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
  14  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
  15  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
  16  * this warranty disclaimer.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/gpio.h>
  21 #include <linux/delay.h>
  22 #include <linux/of_gpio.h>
  23 #include <linux/nfc.h>
  24 #include <net/nfc/nci.h>
  25 #include <net/nfc/nci_core.h>
  26 #include "nfcmrvl.h"
  27
  28 static int nfcmrvl_nci_open(struct nci_dev *ndev)
  29 {
  30         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  31         int err;
  32
  33         if (test_and_set_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  34                 return 0;
  35
  36         /* Reset possible fault of previous session */
  37         clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
  38
  39         err = priv->if_ops->nci_open(priv);
  40
  41         if (err)
  42                 clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags);
  43
  44         return err;
  45 }
  46
  47 static int nfcmrvl_nci_close(struct nci_dev *ndev)
  48 {
  49         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  50
  51         if (!test_and_clear_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
  52                 return 0;
  53
  54         priv->if_ops->nci_close(priv);
  55
  56         return 0;
  57 }
  58
  59 static int nfcmrvl_nci_send(struct nci_dev *ndev, struct sk_buff *skb)
  60 {
  61         struct nfcmrvl_private *priv = nci_get_drvdata(ndev);
  62
  63         nfc_info(priv->dev, "send entry, len %d\n", skb->len);
  64
  65         skb->dev = (void *)ndev;
  66
  67         if (priv->config.hci_muxed) {
  68                 unsigned char *hdr;
  69                 unsigned char len = skb->len;
  70
  71                 hdr = skb_push(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
  72                 hdr[0] = NFCMRVL_HCI_COMMAND_CODE;
  73                 hdr[1] = NFCMRVL_HCI_OGF;
  74                 hdr[2] = NFCMRVL_HCI_OCF;
  75                 hdr[3] = len;
  76         }
  77
  78         return priv->if_ops->nci_send(priv, skb);
  79 }
  80
  81 static int nfcmrvl_nci_setup(struct nci_dev *ndev)
  82 {
  83         __u8 val = 1;
  84
  85         nci_set_config(ndev, NFCMRVL_PB_BAIL_OUT, 1, &val);
  86         return 0;
  87 }
  88
  89 static int nfcmrvl_nci_fw_download(struct nci_dev *ndev,
  90                                    const char *firmware_name)
  91 {
  92         return nfcmrvl_fw_dnld_start(ndev, firmware_name);
  93 }
  94
  95 static struct nci_ops nfcmrvl_nci_ops = {
  96         .open = nfcmrvl_nci_open,
  97         .close = nfcmrvl_nci_close,
  98         .send = nfcmrvl_nci_send,
  99         .setup = nfcmrvl_nci_setup,
 100         .fw_download = nfcmrvl_nci_fw_download,
 101 };
 102
 103 struct nfcmrvl_private *nfcmrvl_nci_register_dev(enum nfcmrvl_phy phy,
 104                                 void *drv_data,
 105                                 struct nfcmrvl_if_ops *ops,
 106                                 struct device *dev,
 107                                 struct nfcmrvl_platform_data *pdata)
 108 {
 109         struct nfcmrvl_private *priv;
 110         int rc;
 111         int headroom;
 112         int tailroom;
 113         u32 protocols;
 114
 115         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 116         if (!priv)
 117                 return ERR_PTR(-ENOMEM);
 118
 119         priv->drv_data = drv_data;
 120         priv->if_ops = ops;
 121         priv->dev = dev;
 122         priv->phy = phy;
 123
 124         memcpy(&priv->config, pdata, sizeof(*pdata));
 125
 126         if (gpio_is_valid(priv->config.reset_n_io)) {
 127                 rc = gpio_request_one(priv->config.reset_n_io,
 128                                       GPIOF_OUT_INIT_LOW,
 129                                       "nfcmrvl_reset_n");
 130                 if (rc < 0) {
 131                         priv->config.reset_n_io = -EINVAL;
 132                         nfc_err(dev, "failed to request reset_n io\n");
 133                 }
 134         }
 135
 136         if (phy == NFCMRVL_PHY_SPI) {
 137                 headroom = NCI_SPI_HDR_LEN;
 138                 tailroom = 1;
 139         } else
 140                 headroom = tailroom = 0;
 141
 142         if (priv->config.hci_muxed)
 143                 headroom += NFCMRVL_HCI_EVENT_HEADER_SIZE;
 144
 145         protocols = NFC_PROTO_JEWEL_MASK
 146                 | NFC_PROTO_MIFARE_MASK
 147                 | NFC_PROTO_FELICA_MASK
 148                 | NFC_PROTO_ISO14443_MASK
 149                 | NFC_PROTO_ISO14443_B_MASK
 150                 | NFC_PROTO_ISO15693_MASK
 151                 | NFC_PROTO_NFC_DEP_MASK;
 152
 153         priv->ndev = nci_allocate_device(&nfcmrvl_nci_ops, protocols,
 154                                          headroom, tailroom);
 155         if (!priv->ndev) {
 156                 nfc_err(dev, "nci_allocate_device failed\n");
 157                 rc = -ENOMEM;
 158                 goto error_free_gpio;
 159         }
 160
 161         rc = nfcmrvl_fw_dnld_init(priv);
 162         if (rc) {
 163                 nfc_err(dev, "failed to initialize FW download %d\n", rc);
 164                 goto error_free_dev;
 165         }
 166
 167         nci_set_drvdata(priv->ndev, priv);
 168
 169         rc = nci_register_device(priv->ndev);
 170         if (rc) {
 171                 nfc_err(dev, "nci_register_device failed %d\n", rc);
 172                 goto error_fw_dnld_deinit;
 173         }
 174
 175         /* Ensure that controller is powered off */
 176         nfcmrvl_chip_halt(priv);
 177
 178         nfc_info(dev, "registered with nci successfully\n");
 179         return priv;
 180
 181 error_fw_dnld_deinit:
 182         nfcmrvl_fw_dnld_deinit(priv);
 183 error_free_dev:
 184         nci_free_device(priv->ndev);
 185 error_free_gpio:
 186         if (gpio_is_valid(priv->config.reset_n_io))
 187                 gpio_free(priv->config.reset_n_io);
 188         kfree(priv);
 189         return ERR_PTR(rc);
 190 }
 191 EXPORT_SYMBOL_GPL(nfcmrvl_nci_register_dev);
 192
 193 void nfcmrvl_nci_unregister_dev(struct nfcmrvl_private *priv)
 194 {
 195         struct nci_dev *ndev = priv->ndev;
 196
 197         if (priv->ndev->nfc_dev->fw_download_in_progress)
 198                 nfcmrvl_fw_dnld_abort(priv);
 199
 200         nfcmrvl_fw_dnld_deinit(priv);
 201
 202         if (gpio_is_valid(priv->config.reset_n_io))
 203                 gpio_free(priv->config.reset_n_io);
 204
 205         nci_unregister_device(ndev);
 206         nci_free_device(ndev);
 207         kfree(priv);
 208 }
 209 EXPORT_SYMBOL_GPL(nfcmrvl_nci_unregister_dev);
 210
 211 int nfcmrvl_nci_recv_frame(struct nfcmrvl_private *priv, struct sk_buff *skb)
 212 {
 213         if (priv->config.hci_muxed) {
 214                 if (skb->data[0] == NFCMRVL_HCI_EVENT_CODE &&
 215                     skb->data[1] == NFCMRVL_HCI_NFC_EVENT_CODE) {
 216                         /* Data packet, let's extract NCI payload */
 217                         skb_pull(skb, NFCMRVL_HCI_EVENT_HEADER_SIZE);
 218                 } else {
 219                         /* Skip this packet */
 220                         kfree_skb(skb);
 221                         return 0;
 222                 }
 223         }
 224
 225         if (priv->ndev->nfc_dev->fw_download_in_progress) {
 226                 nfcmrvl_fw_dnld_recv_frame(priv, skb);
 227                 return 0;
 228         }
 229
 230         if (test_bit(NFCMRVL_NCI_RUNNING, &priv->flags))
 231                 nci_recv_frame(priv->ndev, skb);
 232         else {
 233                 /* Drop this packet since nobody wants it */
 234                 kfree_skb(skb);
 235                 return 0;
 236         }
 237
 238         return 0;
 239 }
 240 EXPORT_SYMBOL_GPL(nfcmrvl_nci_recv_frame);
 241
 242 void nfcmrvl_chip_reset(struct nfcmrvl_private *priv)
 243 {
 244         /* Reset possible fault of previous session */
 245         clear_bit(NFCMRVL_PHY_ERROR, &priv->flags);
 246
 247         if (gpio_is_valid(priv->config.reset_n_io)) {
 248                 nfc_info(priv->dev, "reset the chip\n");
 249                 gpio_set_value(priv->config.reset_n_io, 0);
 250                 usleep_range(5000, 10000);
 251                 gpio_set_value(priv->config.reset_n_io, 1);
 252         } else
 253                 nfc_info(priv->dev, "no reset available on this interface\n");
 254 }
 255
 256 void nfcmrvl_chip_halt(struct nfcmrvl_private *priv)
 257 {
 258         if (gpio_is_valid(priv->config.reset_n_io))
 259                 gpio_set_value(priv->config.reset_n_io, 0);
 260 }
 261
 262 int nfcmrvl_parse_dt(struct device_node *node,
 263                      struct nfcmrvl_platform_data *pdata)
 264 {
 265         int reset_n_io;
 266
 267         reset_n_io = of_get_named_gpio(node, "reset-n-io", 0);
 268         if (reset_n_io < 0) {
 269                 pr_info("no reset-n-io config\n");
 270         } else if (!gpio_is_valid(reset_n_io)) {
 271                 pr_err("invalid reset-n-io GPIO\n");
 272                 return reset_n_io;
 273         }
 274         pdata->reset_n_io = reset_n_io;
 275
 276         if (of_find_property(node, "hci-muxed", NULL))
 277                 pdata->hci_muxed = 1;
 278         else
 279                 pdata->hci_muxed = 0;
 280
 281         return 0;
 282 }
 283 EXPORT_SYMBOL_GPL(nfcmrvl_parse_dt);
 284
 285 MODULE_AUTHOR("Marvell International Ltd.");
 286 MODULE_DESCRIPTION("Marvell NFC driver");
 287 MODULE_LICENSE("GPL v2");